OK let us keep it simple.
a) remove metadata from the equation:
Does the library works OK when you define it via code in SAS EG, DI, Studio or Foundation?
b) When above works, it means your authentication domain is incorrectly set up. Look at the database server connection definition where the Auth Domain is, look at the Usergroup where the auth domain is set up and ensure the user and password is correct, and check again the library and the authentication method. Please, do not use the DefaultAuth authentication domain.
c) When step #a does not work, you should work with your DBA. Before that, perhaps you could debug a little bit the connection, with the SASTRACE option
https://documentation.sas.com/?docsetId=acreldb&docsetTarget=n0732u1mr57ycrn1urf24gzo38sc.htm&docsetVersion=9.4&locale=en
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